6.1 Work Done by a Constant Force( 29sFWθcos=1180cos090cos10cos-===

6.1 Work Done by a Constant ForceExample 1 Pulling a Suitcase-on-WheelsFind the work done if the force is 45.0-N, the angle is 50.0 degrees, and the displacement is 75.0 m.( 29 ( 29[ ]( 29J2170m0.750.50cosN0.45cos===sFWθ

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6.1 Work Done by a Constant ForceExample 3 Accelerating a CrateThe truck is accelerating ata rate of +1.50 m/s2. The massof the crate is 120-kg and itdoes not slip. The magnitude ofthe displacement is 65 m.What is the total work done on the crate by all of the forces acting on it?

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6.2 The Work-Energy Theorem and Kinetic EnergyConsider a constant net external force acting on an object.The object is displaced a distance s, in the same direction asthe net force.The work is simply s∑F( 29( 29smasFW==∑

6.2 The Work-Energy Theorem and Kinetic EnergyTHE WORK-ENERGY THEOREMWhen a net external force does work on and object, the kineticenergy of the object changes according to2212f21ofKEKEomvmvW-=-=

6.2 The Work-Energy Theorem and Kinetic EnergyExample 4 Deep Space 1The mass of the space probe is 474-kg and its initial velocityis 275 m/s. If the 56.0-mN force acts on the probe through adisplacement of 2.42×109m, what is its final speed?

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